Some people want the ability to edit cells for everyone,
Others want to prevent users from adding rows,
Some people want to share the table outside the company,
Others want to protect some columns from modification,
... We may need a spreadsheet permission management screen, although we need to make permissions intuitive enough that we don't fall in situations like:
If a user inserts a spreadsheet on another space, he should be warned if permissions don't match. Etc.